The geometrical arrangement of uncovered and flagged squares
often limits the possible locations that can contain hidden
mines.  shows how the location
of a mine, pointed to by the arrow, has been inferred using the
square on the outside corner showing the numeral one. The geometry
of the corner has left only one uncovered square next to the one.
Inferring the location of a mine at a corner.
The same strategy has been used in  where the square showing the number three
has only three remaining uncovered squares that can hold mines.
to
Inferring the location of mines next along a wall.
In the previous cases we found the location of mines using the
information from a single uncovered square. More advanced play
comes from combining information from two or more uncovered
squares. Consider the arrangement of squares in .
Inferring the location of mines using information from several squares.
If we focus on the leftmost square showing "1" we know that only
a single flag can be contained in the three uncovered squares
highlighted in green in ,
thus we can infer where the second flag for the square showing
"2" must be placed.
finding the first mine by using the leftmost square showing "1".
We can now repeat the same process with the rightmost square showing "1" to place
the second flag, see .
finding the second mine by using the rightmost square showing "1".
